How many knots?

Question

Help someone please, I was looking over a boat, recently, and i need help with a query about it. The engine size is 48hp diesel, the boat 30'long, beam is 10', 3'draft,weight is about 6ton. The questions are,would the engine be powerful enough

for coastal waters, plus,how many knots,would it be capable of

Answer 1

compared to my sons 27 footer with 200 horses I would say you are woefully underpowered. I'm also sure his boat didn't weigh any were near 6 ton.

Answer 2

Mine had just 28hp but was for inland cruising,,,it all depends on the geering and size of propeller

Answer 3

6 ton, what the h**l is it made of? 30 footer with a 10 foot beam and 3 foot draught, what kind of boat is it ? I would be more concerned about the draft in coastal waters. As it stands I reckon no more than 10 knots, but would I guess depend on the size of the s***w. Is it a cobble? Sorry to be so vague butthere are so many factors to be taken into account when looking at sailing coastal. Lo x*x

Answer 4

Well what you describe sounds like a yacht or displacement motor boat, not a high speed job.  I have 36 hp in a 35 footer weighing in at 8 tonnes.  Your 48 hp sounds a bit like a Mercedes and will be plenty of power for a 30 footer.  Actual speed will depend on the prop you have but if you get more than 8 knots I will be surprised.  A 30 foot hull will not go easily over 6 to 7 knots unless you begin to lift and plane and I doubt if you have such a hull from your description.  Reckon on an easy 6 knots and the 48 hp will push you against even a bad headwind - provided the hull is clean and the prop is about right.

Answer 5

A 48/50 hp diesel was quite adequate for for my friend's Oceanis 440 sailing yacht - length 44 ft, beam 13 ft. I think it got to about 10 knots but I'm not sure.

Answer 6

Sounds like a trawler, with a 7-8 kt top end.

Why would the engine 'not' be powerful enough? Any motor that the manufacturer puts in the boat is going to be designed for the boat and more than adequate propulsion for anything the boat is designed to do.

Don't expect to waterski behind it, don't expect to go on poker runs, and don't expect to be able to outrun a storm. But it will get you from A to B on it's own time.

Answer 7

what type of hull does it have and what type of boat

but from first impression yes and probably 8-10 knots